mtd: cfi_cmdset_0002: Initialize datum before calling map_word_load_partial

In do_otp_write we must initialize the variable datum before calling
map_word_load_partial. Otherwise the upper bits of datum may be undefined,
which later causes problems in chip_good called by do_write_oneword.
Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/chips/cfi_cmdset_0002.c

@@ -1295,7 +1295,7 @@ static int do_otp_write(struct map_info *map, struct flchip *chip, loff_t adr,
 		unsigned long bus_ofs = adr & ~(map_bankwidth(map)-1);
 		int gap = adr - bus_ofs;
 		int n = min_t(int, len, map_bankwidth(map) - gap);
-		map_word datum;
+		map_word datum = map_word_ff(map);
 
 		if (n != map_bankwidth(map)) {
 			/* partial write of a word, load old contents */